I feel your pain, I am on my way to buy some St. Johns Wort...what the hell.
My W is very matter of fact as well when we discuus D stuff. I think like me, you need to get this over with. That does not mean giving up hope but it does get that monkey off of your back. I read that once couples get a divorce they are better at seeing eye to eye, and that about 10-13% reunite. Now is when we both need to be careful and not cuase further damage. I am doing this by trying to stay friendly and ACCEPT her feelings and position on things. We we talk about the D, it is always in a civil manner
You will get over this, just as I will. Go for a jog!